US4896585A - Adjustable axial piston machine - Google Patents

Adjustable axial piston machine Download PDF

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Publication number
US4896585A
US4896585A US07/187,388 US18738888A US4896585A US 4896585 A US4896585 A US 4896585A US 18738888 A US18738888 A US 18738888A US 4896585 A US4896585 A US 4896585A
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United States
Prior art keywords
housing
ring
piston machine
sleeve
cylinder
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/187,388
Inventor
Franz Forster
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Linde GmbH
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Linde GmbH
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Publication date
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Assigned to LINDE AKTIENGESELLSCHAFT reassignment LINDE AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FORSTER, FRANZ
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Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B25/00—Regulating, controlling, or safety means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/02—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis with wobble-plate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18296—Cam and slide
    • Y10T74/18336—Wabbler type

Definitions

  • the present invention relates to an adjustable axial piston machine. More specifically, it relates to an adjustable axial piston machine having an annular operating cylinder located around the cylinder drum.
  • the invention proposes to develop a control for such an axial piston machine so that the total structural volume of the axial piston machine is as small as possible, where the surface of the regulating piston is to be as large as possible so that it can be operated with a low control pressure.
  • the operating cylinder-servo piston unit is annular and is arranged around the cylinder drum, i.e., inside of a cylindrical space coaxial to the axis of rotation of the cylinder drum.
  • the result is that the radial extent of the operating cylinder-servo piston unit only has to be relatively small, so that the outside dimensions of the axial piston machine housing can be kept small.
  • the servo piston annular surface Due to the arrangement in a relatively large radius, the servo piston annular surface has a great length and thus requires only a relatively small width in order to furnish a large piston surface. A large piston surface makes it possible to generate the adjusting forces required with a slight control pressure.
  • a particularly expedient implementation form results if the annular space of the operating cylinder is limited outward by the inside wall of the housing hole, in which case the inner wall of the annular space of the operating cylinder is formed of the outside wall of a displaceable cylindrical sleeve that is connected by means of an extending component with a journal that is located on the rocker of the axial piston machine that forms the control, in which case the sleeve has a ring at its outer side that lies in a sliding manner with its cylindrical end surface against the inner wall of the housing hole and which forms the piston surface with its plane surface.
  • This ring can consist of one piece with the sleeve. So long as a satisfactory sealing solution can be found, this ring can consist of a spring expanding ring that is inserted into a groove of the sleeve so that less machining work is required.
  • a space can be provided opposite the cylinder pressure space, in which a pressure spring is located.
  • a sealing ring can be inserted into the back region in the space between the inner wall of the housing hole and the outer wall of the sleeve, which has an end surface that matches the effective piston surface and which can in turn be supported against the control bottom part of the axial piston machine.
  • FIG. 1 shows an axial piston machine that can be swung only in one direction, according to the invention and in axial section.
  • FIG. 2 shows an axial piston machine capable of swinging in both directions from the neutral position, according to the invention and in axial section.
  • the housing 1 is connected with the control bottom part 2 (in a manner not shown in the drawing), in which two fluid channels 3 and 4 are located.
  • the shaft 5 is supported by a roller bearing 6 in the housing 1 and by a roller bearing 7 in the control bottom part 2.
  • the cylindrical drum 8 is connected in a rotation-proof manner with the shaft 5.
  • Cylindrical holes 9 are provided in the cylindrical drum and a piston 10 is capable of sliding in each of these cylindrical holes 9; the piston 10 is supported through a sliding shoe 11 against a swash plate surface 13.
  • the sliding shoes 11 are held in position on the swash plate surface 13 by a hold-down plate 12.
  • the swash plate surface 13 is capable of swinging on a pivot axis 15 that is normal to the plane of the drawing and intersects the axis of the shaft 5.
  • the housing 1 has an inner hole 16, inside of which a sleeve 17, which has an extending part 18, is supported in a sliding manner.
  • a ring 19 is supported in a hole of this extending part 18 and it has an inner spherical surface, inside of which a ball 20 is supported.
  • This ball 20 in turn has a hole through which the journal 21, which is connected solidly with the rocker 14, extends.
  • the outer wall 22 of the sleeve 17 is arranged at a distance from the inner wall 16 of the housing hole so that an annular space 23 is formed between these two walls.
  • a spring 24 is located in this annular space 23.
  • the annular space 23 is limited on the shaft side by a housing projection 25 that has an inner cylindrical surface 26, against which the outer wall of the sleeve 17 lies.
  • a ring 27 is located on the outside wall of the sleeve 17; it lies with its end face against the inner wall 16 of the hole and is also supported against the spring 24.
  • the space 23 is connected through the holes lying outside of the drawing plane with the space in which the rocker 14 is located.
  • a space 28 corresponding to the space 23 is formed between the outer wall of the sleeve 17 and the inner wall of the housing hole 16 on the side of the ring 27 that faces the control bottom.
  • a hole 29 is connected to this space 28.
  • the space 28 is sealed toward the control bottom part 2 by a sealing ring 30, which also serves as a stop for the ring 27.
  • the mode of operation is as follows: if pressure medium is introduced through the hole 29 into the space 28, the pressure of this medium acts on the annular surface of the ring 27 and thus exerts a force that shifts the ring 27 and thus the sleeve 17 toward the left in the drawing, with the result that the rocker 14 is swung counterclockwise over the recess part 18 and the joint 19, 20, 21.
  • the ring 27 is displaced against the force of the spring 24 so that when the pressure in the hole 29 is relieved, the sleeve 17 again shifts toward the right in the drawing.
  • the implementation example according to FIG. 2 differs from that according to FIG. 1 only in the correlation of the dimensions, such that in the depicted position the swash plate surface 113 assumes its position normal to the axis of the shaft 5, with the result that in this position the ring 127 does not lie against a stop, but is in the middle of its displacement path.
  • a second hole 139 is provided in this case and the annular space 123 is not connected through holes with the space in which the rocker 114 is located, but rather is provided with a second sealing ring 140.
  • springs are located in the annular spaces on both sides of the ring 127.
  • a canting or tilting due to the great guide length of the tubular sleeve carrying the piston 27 or 127 need not be feared. None of the components of the control device rotates with the cylindrical drum, although these components are arranged coaxially to the cylindrical drum. The breakdown of the components of the control device also facilitates a constraint-free operation even if the inner sleeve 17 is heated more strongly than the housing 1. In the case of a constant swash plate motor, a disk brake located in the peripheral space around the cylindrical drum can be installed in a housing with identical outside dimensions.
  • the ring 27 can, for example, be a spring expanding ring, a play-free ground piston ring or a set of play-free ground piston rings or can be a wound groove ring, e.g., of a plastic such as that known by the trade name Teflon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)

Abstract

An adjustable axial piston machine is disclosed which has a housing, a cylinder drum and an operating cylinder-servo piston unit capable of being acted upon by control pressure. The cylinder-servo piston unit has a movable part which is being connected with a control of the axial piston machine. The operating cylinder-servo piston unit has an annular configuration and is located around the cylindrical drum.

Description

BACKGROUND OF THE INVENTION
The present invention relates to an adjustable axial piston machine. More specifically, it relates to an adjustable axial piston machine having an annular operating cylinder located around the cylinder drum.
SUMMARY OF THE INVENTION
The invention proposes to develop a control for such an axial piston machine so that the total structural volume of the axial piston machine is as small as possible, where the surface of the regulating piston is to be as large as possible so that it can be operated with a low control pressure.
This problem is solved according to the invention in that the operating cylinder-servo piston unit is annular and is arranged around the cylinder drum, i.e., inside of a cylindrical space coaxial to the axis of rotation of the cylinder drum. The result is that the radial extent of the operating cylinder-servo piston unit only has to be relatively small, so that the outside dimensions of the axial piston machine housing can be kept small. Due to the arrangement in a relatively large radius, the servo piston annular surface has a great length and thus requires only a relatively small width in order to furnish a large piston surface. A large piston surface makes it possible to generate the adjusting forces required with a slight control pressure.
A particularly expedient implementation form results if the annular space of the operating cylinder is limited outward by the inside wall of the housing hole, in which case the inner wall of the annular space of the operating cylinder is formed of the outside wall of a displaceable cylindrical sleeve that is connected by means of an extending component with a journal that is located on the rocker of the axial piston machine that forms the control, in which case the sleeve has a ring at its outer side that lies in a sliding manner with its cylindrical end surface against the inner wall of the housing hole and which forms the piston surface with its plane surface. This ring can consist of one piece with the sleeve. So long as a satisfactory sealing solution can be found, this ring can consist of a spring expanding ring that is inserted into a groove of the sleeve so that less machining work is required.
As is known, a space can be provided opposite the cylinder pressure space, in which a pressure spring is located.
So that the housing hole can extend inward up to the end of the housing jacket, a sealing ring can be inserted into the back region in the space between the inner wall of the housing hole and the outer wall of the sleeve, which has an end surface that matches the effective piston surface and which can in turn be supported against the control bottom part of the axial piston machine.
The invention is elucidated in greater detail on the basis of the implementation examples shown in the drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an axial piston machine that can be swung only in one direction, according to the invention and in axial section.
FIG. 2 shows an axial piston machine capable of swinging in both directions from the neutral position, according to the invention and in axial section.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The housing 1 is connected with the control bottom part 2 (in a manner not shown in the drawing), in which two fluid channels 3 and 4 are located. The shaft 5 is supported by a roller bearing 6 in the housing 1 and by a roller bearing 7 in the control bottom part 2. The cylindrical drum 8 is connected in a rotation-proof manner with the shaft 5. Cylindrical holes 9 are provided in the cylindrical drum and a piston 10 is capable of sliding in each of these cylindrical holes 9; the piston 10 is supported through a sliding shoe 11 against a swash plate surface 13. The sliding shoes 11 are held in position on the swash plate surface 13 by a hold-down plate 12. The swash plate surface 13 is capable of swinging on a pivot axis 15 that is normal to the plane of the drawing and intersects the axis of the shaft 5.
The housing 1 has an inner hole 16, inside of which a sleeve 17, which has an extending part 18, is supported in a sliding manner. A ring 19 is supported in a hole of this extending part 18 and it has an inner spherical surface, inside of which a ball 20 is supported. This ball 20 in turn has a hole through which the journal 21, which is connected solidly with the rocker 14, extends.
The outer wall 22 of the sleeve 17 is arranged at a distance from the inner wall 16 of the housing hole so that an annular space 23 is formed between these two walls. A spring 24 is located in this annular space 23. The annular space 23 is limited on the shaft side by a housing projection 25 that has an inner cylindrical surface 26, against which the outer wall of the sleeve 17 lies. A ring 27 is located on the outside wall of the sleeve 17; it lies with its end face against the inner wall 16 of the hole and is also supported against the spring 24. The space 23 is connected through the holes lying outside of the drawing plane with the space in which the rocker 14 is located.
A space 28 corresponding to the space 23 is formed between the outer wall of the sleeve 17 and the inner wall of the housing hole 16 on the side of the ring 27 that faces the control bottom. A hole 29 is connected to this space 28. The space 28 is sealed toward the control bottom part 2 by a sealing ring 30, which also serves as a stop for the ring 27.
The mode of operation is as follows: if pressure medium is introduced through the hole 29 into the space 28, the pressure of this medium acts on the annular surface of the ring 27 and thus exerts a force that shifts the ring 27 and thus the sleeve 17 toward the left in the drawing, with the result that the rocker 14 is swung counterclockwise over the recess part 18 and the joint 19, 20, 21. The ring 27 is displaced against the force of the spring 24 so that when the pressure in the hole 29 is relieved, the sleeve 17 again shifts toward the right in the drawing.
The implementation example according to FIG. 2 differs from that according to FIG. 1 only in the correlation of the dimensions, such that in the depicted position the swash plate surface 113 assumes its position normal to the axis of the shaft 5, with the result that in this position the ring 127 does not lie against a stop, but is in the middle of its displacement path. Outside of the hole 129, a second hole 139 is provided in this case and the annular space 123 is not connected through holes with the space in which the rocker 114 is located, but rather is provided with a second sealing ring 140.
If necessary, springs are located in the annular spaces on both sides of the ring 127.
Although the adjusting force engages strongly on the piston away from the center, a canting or tilting due to the great guide length of the tubular sleeve carrying the piston 27 or 127 need not be feared. None of the components of the control device rotates with the cylindrical drum, although these components are arranged coaxially to the cylindrical drum. The breakdown of the components of the control device also facilitates a constraint-free operation even if the inner sleeve 17 is heated more strongly than the housing 1. In the case of a constant swash plate motor, a disk brake located in the peripheral space around the cylindrical drum can be installed in a housing with identical outside dimensions.
For a favorable common design of the sleeve 17 and its extending part 18 it is provided that the sleeve 17 ends in an obliquely cut surface 99 on the rocker side. The ring 27 can, for example, be a spring expanding ring, a play-free ground piston ring or a set of play-free ground piston rings or can be a wound groove ring, e.g., of a plastic such as that known by the trade name Teflon.
While certain presently preferred embodiments of the invention have been described above, it is to be distinctly understood that the invention is not limited thereto and may be otherwise variously practiced within the scope of the following claims.

Claims (4)

I claim:
1. An adjustable axial piston machine having a housing, a rotating cylinder drum and an operating cylinder-servo piston unit capable of being acted upon by control pressure of low pressure, said cylinder-servo piston unit having a non-rotatable movable part being connected with a control of the axial piston machine having an annular configuration and being located around the cylinder drum.
2. An adjustable axial piston machine having a housing, a rotating cylinder drum and an operating cylinder-servo piston unit capable of being acted upon by control pressure of low pressure, said cylinder-servo piston unit having a non-rotatable movable part being connected with a control of the axial piston machine having an annular configuration and being located around the cylinder drum, wherein the operating cylinder has an annular space therein, an outside wall of said annular space being formed by a wall of a hole provided in said housing and the inner wall thereof being formed by an outside wall of a displaceable non-rotating cylinder sleeve, said sleeve being connected by means of an extending part with a pull-in-step journal to a rocker, said piston machine further comprising a ring stand outward, forming a piston said ring having an outer edge lying on the wall of the hole in said housing and said ring having an inner edge connected with the sleeve.
3. Axial piston machine according to claim 2, wherein the hole in the housing passes through a control bottom side and further comprising a sealing ring located in the region of the control bottom between the outside wall of the sleeve and the wall of the housing hole, said sealing ring being supported against a control bottom part.
4. Axial piston machine according to claim 2, wherein said ring is a spring ring inserted into a groove provided in the sleeve.
US07/187,388 1987-05-05 1988-04-28 Adjustable axial piston machine Expired - Fee Related US4896585A (en)

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Application Number Priority Date Filing Date Title
DE3714888A DE3714888C2 (en) 1987-05-05 1987-05-05 Adjustable axial piston machine
DE3714888 1987-05-05

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FR (1) FR2614936B1 (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079993A (en) * 1989-02-17 1992-01-14 Linde Aktiengesellschaft Axial piston machine
US5241822A (en) * 1991-09-11 1993-09-07 Brueninghaus Hydraulik Gmbh Axial piston machine for installation in a gearbox
US5678405A (en) * 1995-04-07 1997-10-21 Martin Marietta Corporation Continuously variable hydrostatic transmission
US5794515A (en) * 1997-04-03 1998-08-18 Bethke; Donald G. Swashplate control system for an axial piston pump
GB2338745A (en) * 1998-06-25 1999-12-29 William May Stott Reciprocating piston engine with Z-crank and adjustable piston stroke
US6092457A (en) * 1997-08-06 2000-07-25 Kayaba Kogyo Kabushiki Kaisha Hydraulic pump or motor
US6109034A (en) * 1997-04-25 2000-08-29 General Dynamics Land Systems, Inc. Continuously variable hydrostatic transmission ratio controller capable of generating amplified stroking forces
US6360647B1 (en) * 1998-04-17 2002-03-26 Parker Hannifin Ab Hydraulic rotating axial piston engine
CN1085803C (en) * 1999-05-18 2002-05-29 徐维胜 Double inclined plate synchronous rotation internal power split stream hydraulic variable speed unit
US6425313B1 (en) * 1998-02-24 2002-07-30 Apis Energy Gmbh Axial piston motor
US6655255B2 (en) 2001-07-10 2003-12-02 Caterpillar Inc. Swashplate arrangement for an axial piston pump
US6688417B2 (en) 2001-10-09 2004-02-10 Sauer-Danfoss Inc. Axial piston unit for integrated wheel hub
US6715997B2 (en) 2001-04-30 2004-04-06 Sauer-Danfoss Inc. Housing for a rotary hydraulic unit with a servo piston
US20040112048A1 (en) * 2002-12-13 2004-06-17 Kuo-Hsiang Chien Stirling engine with variable stroke
US20040173396A1 (en) * 1998-09-03 2004-09-09 Permo-Drive Research And Development Pty. Ltd. Energy management system
US20060123984A1 (en) * 2003-06-06 2006-06-15 Guenter Wanschura Longitudinally adjustable reversible axial piston machine
US20180045185A1 (en) * 2015-02-09 2018-02-15 Eaton Corporation Torque control system for a variable displacement pump
US20180112530A1 (en) * 2016-10-20 2018-04-26 Deere & Company Drive assembly with pressure force aggregating piston arrangement for hydraulic motor speed/torque selector
US11598322B2 (en) * 2020-02-13 2023-03-07 Robert Bosch Gmbh Hydrostatic axial piston machine of swash plate construction

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0776548B2 (en) * 1992-11-25 1995-08-16 帝人製機株式会社 Variable speed hydraulic motor
DE4415510C1 (en) * 1994-05-03 1995-07-27 Hydromobil Hydraulik Handelsge Axial piston pump of vehicle
DE102010062951A1 (en) * 2010-12-13 2012-06-14 Zf Friedrichshafen Ag Actuating device for e.g. hydrostatic axial piston machine, has coupling device that includes sliding block which is pivotally mounted on actuating piston about rotational axis

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US2722889A (en) * 1945-12-17 1955-11-08 Sundstrand Machine Tool Co Servo-type control for pumps
DE2037635A1 (en) * 1970-07-29 1972-02-03 Robert Bosch Gmbh, 7000 Stuttgart Adjustable axial piston machine
US3834281A (en) * 1972-01-31 1974-09-10 Linde Ag Control system for axial-piston machines and the like
US4030404A (en) * 1974-08-06 1977-06-21 U.S. Philips Corporation Swash-plate drive mechanism
DE2620523A1 (en) * 1976-05-10 1977-12-01 Linde Ag AXIAL PISTON MACHINE ACCORDING TO THE INCLINED DISC PRINCIPLE
US4205590A (en) * 1978-02-06 1980-06-03 Moog Inc. Positive feedback mechanism for servocontroller of fluid operated actuator
US4543876A (en) * 1983-01-27 1985-10-01 Linde Aktiengesellschaft Axial piston machine having adjustable hydrostatically supported swashplate

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FR1290143A (en) * 1960-11-21 1962-04-13 Renault Regulator for hydraulic variator
FR2057401A5 (en) * 1969-08-18 1971-05-21 Lucas Industries Ltd
DE2451380C2 (en) * 1974-10-29 1985-08-14 Linde Ag, 6200 Wiesbaden Adjustable axial piston motor with a swivel vane actuator
DE3232363A1 (en) * 1981-09-09 1983-03-24 Linde Ag, 6200 Wiesbaden Adjustable axial piston machine of swash plate construction with a cradle body supported in a sliding bearing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722889A (en) * 1945-12-17 1955-11-08 Sundstrand Machine Tool Co Servo-type control for pumps
DE2037635A1 (en) * 1970-07-29 1972-02-03 Robert Bosch Gmbh, 7000 Stuttgart Adjustable axial piston machine
US3834281A (en) * 1972-01-31 1974-09-10 Linde Ag Control system for axial-piston machines and the like
US4030404A (en) * 1974-08-06 1977-06-21 U.S. Philips Corporation Swash-plate drive mechanism
DE2620523A1 (en) * 1976-05-10 1977-12-01 Linde Ag AXIAL PISTON MACHINE ACCORDING TO THE INCLINED DISC PRINCIPLE
US4205590A (en) * 1978-02-06 1980-06-03 Moog Inc. Positive feedback mechanism for servocontroller of fluid operated actuator
US4543876A (en) * 1983-01-27 1985-10-01 Linde Aktiengesellschaft Axial piston machine having adjustable hydrostatically supported swashplate

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079993A (en) * 1989-02-17 1992-01-14 Linde Aktiengesellschaft Axial piston machine
US5241822A (en) * 1991-09-11 1993-09-07 Brueninghaus Hydraulik Gmbh Axial piston machine for installation in a gearbox
US5678405A (en) * 1995-04-07 1997-10-21 Martin Marietta Corporation Continuously variable hydrostatic transmission
US5794515A (en) * 1997-04-03 1998-08-18 Bethke; Donald G. Swashplate control system for an axial piston pump
US6109034A (en) * 1997-04-25 2000-08-29 General Dynamics Land Systems, Inc. Continuously variable hydrostatic transmission ratio controller capable of generating amplified stroking forces
US6092457A (en) * 1997-08-06 2000-07-25 Kayaba Kogyo Kabushiki Kaisha Hydraulic pump or motor
US6425313B1 (en) * 1998-02-24 2002-07-30 Apis Energy Gmbh Axial piston motor
US6360647B1 (en) * 1998-04-17 2002-03-26 Parker Hannifin Ab Hydraulic rotating axial piston engine
GB2338745B (en) * 1998-06-25 2003-01-22 William May Stott Reciprocating piston engine
GB2338745A (en) * 1998-06-25 1999-12-29 William May Stott Reciprocating piston engine with Z-crank and adjustable piston stroke
US20040173396A1 (en) * 1998-09-03 2004-09-09 Permo-Drive Research And Development Pty. Ltd. Energy management system
CN1085803C (en) * 1999-05-18 2002-05-29 徐维胜 Double inclined plate synchronous rotation internal power split stream hydraulic variable speed unit
US6715997B2 (en) 2001-04-30 2004-04-06 Sauer-Danfoss Inc. Housing for a rotary hydraulic unit with a servo piston
US6655255B2 (en) 2001-07-10 2003-12-02 Caterpillar Inc. Swashplate arrangement for an axial piston pump
US6688417B2 (en) 2001-10-09 2004-02-10 Sauer-Danfoss Inc. Axial piston unit for integrated wheel hub
US20040112048A1 (en) * 2002-12-13 2004-06-17 Kuo-Hsiang Chien Stirling engine with variable stroke
US6810665B2 (en) * 2002-12-13 2004-11-02 Industrial Technology Research Institute Stirling engine with variable stroke
US20060123984A1 (en) * 2003-06-06 2006-06-15 Guenter Wanschura Longitudinally adjustable reversible axial piston machine
US7367258B2 (en) * 2003-06-06 2008-05-06 Brueninghaus Hydromatik Gmbh Longitudinally adjustable reversible axial piston machine
US20180045185A1 (en) * 2015-02-09 2018-02-15 Eaton Corporation Torque control system for a variable displacement pump
US10859069B2 (en) * 2015-02-09 2020-12-08 Eaton Intelligent Power Limited Torque control system for a variable displacement pump
US11536265B2 (en) 2015-02-09 2022-12-27 Danfoss Power Solutions Ii Technology A/S Torque control system for a variable displacement pump
US20180112530A1 (en) * 2016-10-20 2018-04-26 Deere & Company Drive assembly with pressure force aggregating piston arrangement for hydraulic motor speed/torque selector
CN107965558A (en) * 2016-10-20 2018-04-27 迪尔公司 The actuator assembly with pressure polymerisation piston apparatus for hydraulic motor speed/torque selector
US10138729B2 (en) * 2016-10-20 2018-11-27 Deere & Company Drive assembly with pressure force aggregating piston arrangement for hydraulic motor speed/torque selector
CN107965558B (en) * 2016-10-20 2022-05-03 迪尔公司 Driver assembly with pressure aggregating piston device for hydraulic motor speed/torque selector
US11598322B2 (en) * 2020-02-13 2023-03-07 Robert Bosch Gmbh Hydrostatic axial piston machine of swash plate construction

Also Published As

Publication number Publication date
FR2614936A1 (en) 1988-11-10
DE3714888C2 (en) 1994-10-06
FR2614936B1 (en) 1994-04-01
JPS63280873A (en) 1988-11-17
DE3714888A1 (en) 1988-11-24

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